Internal-combustion engine



mmrm comsusnou ENGINE.

APPLICATION FILED .IAN. 3.1917- Patented Jan. 13,1920.

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BY wh qg ATTORNEY Patented Jan. 13, 1920.

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ROBERT L. FOLKS, OF WAYCROSS, GEORGIA.

INTERNAL-COMBUSTION ENGINE.

Specification of Lettersl'atent.

Patented J an. 13, 1920.

To all whom it may concern:

Be it known that 1, ROBERT L. FOLKS, a citizen of the United States, residing at Waycross, in the countyof Ware and State of Georgia, have invented new .and useful Improvements in Internal-Combustion Engines, of which the following is a specification.

This invention comprehends improvements in internal combustion engines and relates more particularly to engines .of the two cycle type.

One of the objects of the invention is to provide a two cycle internal combustion engine having a main piston and an auxiliary.

piston operating in longitudinal alinement with each other within the cylinder, the auxiliary piston being provided with a spark plug adapted to contact with a contact member to produce a spark within the firing chamber.

The invention also aims to provide a two cycle internal combustion engine of extremely simple construction, free from complicating parts and which may be manufactured at a relatively low cost.

With these and other-objects in view as will become more apparent as thedescription proceeds, the invention consists in certain novel features of construction, combination and arrangement of parts as will. be hereinafter fully illustrated, described and claimed.

In the drawings, Figure 1 is a vertical sectional view through the engine showing the parts in position ready for firing.

Fig. 2 is a vertical sectional view showing the pistons in their lowered positions. Fig. 3 is a side elevation of the engine.

Fig. 4 is a top plan view partly in section.

Fig. 5 is a perspective view of the ignition contact member, and

Fig. 6 is a fra mentary sectional view ofv the contact mem er.

Referring in detail to the drawings by nu 'merals, 1 designates the cylinder having a water jacket 2 and a head 3 secured; in position by bolts 4 or in any other desired manner. A crank case 5 is attached to and closes the lower end of the cylinder. Within the cylinder is a main piston 6 and an auxiliary piston 7. The main piston is relatively large and is secured by the connecting 12 bears at its inner end against the cylinder head and at its outer end against a washer 1 1 which is held against longitudinal movement relative to the arm by the pin 15. This spring tends to draw the auxiliary piston outwardly toward the cylinder head 3.

To force the piston 7 inwardly against the tension of the spring 13,1 have provided a cam or eccentric 16 secured to the shaft 17. This shaft is driven by a sprocket chain 18 running over the sprocket 19 secured to the rod and over the sprocket 20 fixed to the crank shaft. The eccentric rides against the end of the arm 12 and is formed with a curved face 21, a straight face 22 and a curved face 23.

The auxiliary piston 7 carries a spark plug 24 which projects through one of the openings '25 in the spider-like cylinder head and engages the spring contact 26 to produce a spark within the cylinder. The spring contact 26 is secured to a lever 27 mounted upon a shaft 28 journaled in the brackets 29 on the cylinder head. The contact member 26 is insulated from the lever 27 and carries a binding post 30 to which one of the ignition wires 31 is connected.

The lever 27 is formed with an opening through which the shaft 28 extends and car ries a set screw 32 for locking engagement with the shaft. Any suitable operating means may be connected to the outer end of the lever 27 to be controlled from the steering wheel for the purpose of adjusting the position of the'contact member 26 when'it is desired to advance or retard the spark.

When the pistons are arranged as shown in Fig. 1 they are in firing position and when an explosion takes place between them, the main piston 6 will be driven downwardly uncovering the exhaust port 33 and the intake port 34. As the main piston moves downwardly the eccentric '16 drives the auxiliary piston downwardly. When the gases have been discharged the face 21 of the eccentric rides past thearm 12 whereupon the spring 13-draws the auxiliary piston outwardly and this outward movement of the piston sucks a fresh charge of gas into the cylinder which gas is compressed on the outward movement of the piston 6. The face 23 of the cam'16 prevents the auxiliary piston prematurely reaching the limit of its outward movement and exploding the charge within the cylinder beforethe main iston has completed its compression stroke.

he openings 25 in the cylinder head 3 allow for an escape of air in front of the auxiliary piston so that it will have a free outward. movement to engage the spark plug with the contact member 26 as soon as the face 23 rides past the arm 12. The set screw 32 and the turn buckle 35 allow the lever 27, to be adjusted for any length of spark plug.

vided a very simple and practical two cycle internal combustlon engine which is without complicating parts, which is very efficient and which may be manufactured very cheaply,

While I have shown and described the preferred embodiments of my invention it will be clearly understood that I do not wish to be limited to this construction, but may make such changes as will fall within the scope and spirit of the invention as claime What I claim is 1. In a two-cycle engine, a cylinder, a main crank shaft, a main piston coupled by a connecting rod to said crank shaft and adapted to overrun the inlet and exhaust reeaiai ports of the cylinder, said cylinder having a spider-like head with constantly open orifices, an auxiliary iston in said cylinder having a rigidly attac ed piston rod guided by said 0 linder head, a rotary cam cooperating wit said piston rod to move the auxiliary piston toward the main piston, means for moving the latter away from the main piston with a relative] quick action, driving means between sai crank shaft and rotary cam, an ignition element carried by the auxiliary piston and adapted to pass through the spider-like cylinder head, and an ignition member pivotally supported by the cylinder head and adapted to contact with the first named ignition element.

\ 2. Ina two cycle engine, acylinder, a main crank shaft, a main piston coupled by a connecting rod to said crankshaft and adapted to overrun the inlet and exhaust ports of the cylinder, said cylinder having a spider- 'like head with constantly open orifioes, an

auxiliary piston in' said cylinder having a -rigidly attached piston rod guided by said cylmder head, a rotary cam cooperating with said piston rod to move the auxiliary piston toward the main piston, means for moving the latter away from the main piston with a relatively quick action, driving means between said crank shaft and rotary cam, an ignition element carried by the aux iliary piston and ada ted to pass through the spider-like cylindzr head, an ignition member pivotally supported by the cylinder head and adapted to contact with the first named ignition element, and an annular abutment flange on the head of the auxiliary piston, the cylinder head having an annular groove to receive said flange.

In testimony whereof I a'fiix my signature.

ROBERT L. FOLKS. 

